Er{sup 3+}-doped PbF{sub 2}: Comparison between nanocrystals in glass-ceramics and bulk single crystals

An appropriate annealing of a GeO{sub 2}-PbO-PbF{sub 2}:ErF{sub 3} glass leads to the formation of a glass-ceramic, composed of Pb{sub 1-} {sub x} Er {sub x} F{sub 2+} {sub x} nanosized crystallites dispersed throughout an amorphous oxide matrix. These nanocrystallites are compared to Er{sup 3+}-dop...

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Bibliographic Details
Published inJournal of solid state chemistry Vol. 179; no. 7
Main Authors Dantelle, G., Mortier, M., Patriarche, G., Vivien, D.
Format Journal Article
LanguageEnglish
Published United States 15.07.2006
Subjects
ANNEALING
CERAMICS
CRYSTALLOGRAPHY
DOPED MATERIALS
ERBIUM FLUORIDES
ERBIUM IONS
FLUORESCENCE
GERMANIUM OXIDES
GLASS
LEAD FLUORIDES
LEAD OXIDES
MATERIALS SCIENCE
MONOCRYSTALS
NANOSTRUCTURES
OPTICAL PROPERTIES
OXYFLUORIDES
SEGREGATION
STRONG INTERACTIONS
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Summary:An appropriate annealing of a GeO{sub 2}-PbO-PbF{sub 2}:ErF{sub 3} glass leads to the formation of a glass-ceramic, composed of Pb{sub 1-} {sub x} Er {sub x} F{sub 2+} {sub x} nanosized crystallites dispersed throughout an amorphous oxide matrix. These nanocrystallites are compared to Er{sup 3+}-doped PbF{sub 2} bulk single crystals. The influence of the annealing temperature on the glass-ceramics characteristics is thoroughly investigated. For several glass-ceramics resulting from different heat treatments, the quantity of crystallized PbF{sub 2}, as well as the segregation of Er{sup 3+} ions into the crystallites, has been studied through two methods: first, the study of the crystallographic characteristics and second, the evolution of the optical properties. It was evidenced that, for a heat treatment over 365 deg. C, the whole PbF{sub 2}:Er has completely crystallized and that the segregation of Er{sup 3+} ions into the crystallites was total. Strong interactions between Er{sup 3+} ions occur in the Pb{sub 1-} {sub x} Er {sub x} F{sub 2+} {sub x} single and nanocrystals, promoting cross-relaxation processes, under 488-nm excitation, and favouring the 660- (red) and 810-nm emissions at the expense of the 550-nm (green) one. - Graphical abstract: TEM image of an oxyfluoride glass-ceramic containing Er{sup 3+}-doped {beta}-PbF{sub 2} nanocrystals. Display Omitted.
ISSN:0022-4596
1095-726X
DOI:10.1016/j.jssc.2006.03.038